I suspect that durability would be an issue. A few years back our squad club ran a fireworks booth, and of course I had to take my turn working in it. We found all kinds of CA legal fireworks that were leaking powder while still in the factory boxes, and some that would start leaking as you removed them from the box to hand to a buyer. It would be a real bummer to carry something around in your pack for emergency signalling, get into a jam, dig your made in China gizmo out of your pack only to find that it has leaked itself to death...